Revert of Add GN build rules to allow java_assertion_enabler to enable Java asserts.

build/android/java_assertion_enabler/java/org/chromium/javaassertionenabler/AssertionEnabler.java

Index: build/android/java_assertion_enabler/java/org/chromium/javaassertionenabler/AssertionEnabler.java
diff --git a/build/android/java_assertion_enabler/java/org/chromium/javaassertionenabler/AssertionEnabler.java b/build/android/java_assertion_enabler/java/org/chromium/javaassertionenabler/AssertionEnabler.java
index beb26facda44e40dc31ec9ced6e18415803a29c9..e800a3941395b34a4afc96938c6dac999b3b86c4 100644
--- a/build/android/java_assertion_enabler/java/org/chromium/javaassertionenabler/AssertionEnabler.java
+++ b/build/android/java_assertion_enabler/java/org/chromium/javaassertionenabler/AssertionEnabler.java
@@ -3,6 +3,8 @@
 // found in the LICENSE file.
 
 package org.chromium.javaassertionenabler;
+
+import com.google.common.io.ByteStreams;
 
 import org.objectweb.asm.ClassReader;
 import org.objectweb.asm.ClassVisitor;
@@ -12,30 +14,21 @@
 
 import java.io.BufferedInputStream;
 import java.io.BufferedOutputStream;
-import java.io.ByteArrayOutputStream;
-import java.io.FileInputStream;
 import java.io.FileOutputStream;
 import java.io.IOException;
-import java.io.InputStream;
-import java.nio.file.Files;
-import java.nio.file.Path;
-import java.nio.file.Paths;
-import java.nio.file.StandardCopyOption;
-import java.util.zip.ZipEntry;
-import java.util.zip.ZipInputStream;
-import java.util.zip.ZipOutputStream;
+import java.util.Collections;
+import java.util.jar.JarEntry;
+import java.util.jar.JarFile;
+import java.util.jar.JarOutputStream;
 
 /**
  * An application that enables Java ASSERT statements by modifying Java bytecode. It takes in a JAR
  * file, modifies bytecode of classes that use ASSERT, and outputs the bytecode to a new JAR file.
  */
 class AssertionEnabler {
-    static final String ASSERTION_DISABLED_NAME = "$assertionsDisabled";
     static final String CLASS_FILE_SUFFIX = ".class";
     static final String STATIC_INITIALIZER_NAME = "<clinit>";
-    static final String TEMPORARY_FILE_SUFFIX = ".temp";
-
-    static final int BUFFER_SIZE = 16384;
+    static final String ASSERTION_DISABLED_NAME = "$assertionsDisabled";
 
     static class AssertionEnablerVisitor extends ClassVisitor {
         AssertionEnablerVisitor(ClassWriter writer) {
@@ -75,52 +68,32 @@
         }
     }
 
-    static byte[] readAllBytes(InputStream inputStream) throws IOException {
-        ByteArrayOutputStream buffer = new ByteArrayOutputStream();
-        int numRead = 0;
-        byte[] data = new byte[BUFFER_SIZE];
-        while ((numRead = inputStream.read(data, 0, data.length)) != -1) {
-            buffer.write(data, 0, numRead);
-        }
+    static void enableAssertionInJar(String inputJarPath, String outputJarPath) {
+        try (JarOutputStream outputStream = new JarOutputStream(
+                new BufferedOutputStream(new FileOutputStream(outputJarPath)))) {
+            JarFile jarFile = new JarFile(inputJarPath);
+            for (JarEntry entry : Collections.list(jarFile.entries())) {
+                try (BufferedInputStream inputStream = new BufferedInputStream(
+                        jarFile.getInputStream(entry))) {
+                    byte[] byteCode = ByteStreams.toByteArray(inputStream);
 
-        return buffer.toByteArray();
-    }
-
-    static void enableAssertionInJar(String inputJarPath, String outputJarPath) {
-        String tempJarPath = outputJarPath + TEMPORARY_FILE_SUFFIX;
-        try (ZipInputStream inputStream = new ZipInputStream(
-                    new BufferedInputStream(new FileInputStream(inputJarPath)));
-             ZipOutputStream tempStream = new ZipOutputStream(
-                    new BufferedOutputStream(new FileOutputStream(tempJarPath)))) {
-            ZipEntry entry = null;
-
-            while ((entry = inputStream.getNextEntry()) != null) {
-                byte[] byteCode = readAllBytes(inputStream);
-
-                if (entry.isDirectory() || !entry.getName().endsWith(CLASS_FILE_SUFFIX)) {
-                    tempStream.putNextEntry(entry);
-                    tempStream.write(byteCode);
-                    tempStream.closeEntry();
-                    continue;
+                    if (entry.isDirectory() || !entry.getName().endsWith(CLASS_FILE_SUFFIX)) {
+                        outputStream.putNextEntry(entry);
+                        outputStream.write(byteCode);
+                        outputStream.closeEntry();
+                        continue;
+                    }
+                    ClassReader reader = new ClassReader(byteCode);
+                    ClassWriter writer = new ClassWriter(reader, 0);
+                    reader.accept(new AssertionEnablerVisitor(writer), 0);
+                    byte[] patchedByteCode = writer.toByteArray();
+                    outputStream.putNextEntry(new JarEntry(entry.getName()));
+                    outputStream.write(patchedByteCode);
+                    outputStream.closeEntry();
                 }
-                ClassReader reader = new ClassReader(byteCode);
-                ClassWriter writer = new ClassWriter(reader, 0);
-                reader.accept(new AssertionEnablerVisitor(writer), 0);
-                byte[] patchedByteCode = writer.toByteArray();
-                tempStream.putNextEntry(new ZipEntry(entry.getName()));
-                tempStream.write(patchedByteCode);
-                tempStream.closeEntry();
             }
         } catch (IOException e) {
             throw new RuntimeException(e);
-        }
-
-        try {
-            Path src = Paths.get(tempJarPath);
-            Path dest = Paths.get(outputJarPath);
-            Files.move(src, dest, StandardCopyOption.REPLACE_EXISTING);
-        } catch (IOException ioException) {
-            throw new RuntimeException(ioException);
         }
     }